Download How to Read a Surface Map Surface maps depict the large

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts
no text concepts found
Transcript
How to Read a Surface Map
Surface maps depict the large-scale elements of the weather. These elements include
high and low pressure systems, cold and warm fronts, and precipitation areas.
A high pressure system is an area of relative pressure maximum that has diverging
winds and a rotation opposite to the earth's rotation. Fair weather is typically associated
with high pressure.
A low pressure system is an area of relative pressure minimum that has converging
winds and rotates in the same direction as the earth. This is counterclockwise in the
Northern Hemisphere and clockwise in the Southern Hemisphere. Stormy weather is
often associated with low pressure systems.
A cold front is the leading edge of an advancing cold air mass that is under running and
displacing the warmer air in its path. Generally, with the passage of a cold front, the
temperature and humidity decrease, the pressure rises, and the wind shifts (usually
from the southwest to the northwest in the Northern Hemisphere). Precipitation is
generally at and/or behind the front, and with a fast-moving system, a squall line may
develop ahead of the front.
A warm front is the leading edge of an advancing warm air mass that is replacing a
retreating relatively colder air mass. Generally, with the passage of a warm front, the
temperature and humidity increase, the pressure rises, and although the wind shifts
(usually from the southwest to the northwest in the Northern Hemisphere), it is not as
pronounced as with a cold frontal passage. Precipitation, in the form of rain, snow, or
drizzle, is generally found ahead of the surface front, as well as convective showers and
thunderstorms. Fog is common in the cold air ahead of the front. Although clearing
usually occurs after passage, some conditions may produce fog in the warm air.
Where would these symbols go on the surface map?